1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>uart_parse_earlycon</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="uart16x50.html" title="Chapter&#160;6.&#160;16x50 UART Driver"><link rel="prev" href="API-uart-console-write.html" title="uart_console_write"><link rel="next" href="API-uart-parse-options.html" title="uart_parse_options"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">uart_parse_earlycon</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-uart-console-write.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;6.&#160;16x50 UART Driver</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-uart-parse-options.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-uart-parse-earlycon"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>uart_parse_earlycon &#8212; 
2     Parse earlycon options
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">uart_parse_earlycon </b>(</code></td><td>char * <var class="pdparam">p</var>, </td></tr><tr><td>&#160;</td><td>unsigned char * <var class="pdparam">iotype</var>, </td></tr><tr><td>&#160;</td><td>unsigned long * <var class="pdparam">addr</var>, </td></tr><tr><td>&#160;</td><td>char ** <var class="pdparam">options</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1113810060"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>p</code></em></span></dt><dd><p>
4     ptr to 2nd field (ie., just beyond '&lt;name&gt;,')
5    </p></dd><dt><span class="term"><em class="parameter"><code>iotype</code></em></span></dt><dd><p>
6     ptr for decoded iotype (out)
7    </p></dd><dt><span class="term"><em class="parameter"><code>addr</code></em></span></dt><dd><p>
8     ptr for decoded mapbase/iobase (out)
9    </p></dd><dt><span class="term"><em class="parameter"><code>options</code></em></span></dt><dd><p>
10     ptr for &lt;options&gt; field; NULL if not present (out)
11    </p></dd></dl></div></div><div class="refsect1"><a name="idp1113814916"></a><h2>Description</h2><p>
12   Decodes earlycon kernel command line parameters of the form
13   earlycon=&lt;name&gt;,io|mmio|mmio32,&lt;addr&gt;,&lt;options&gt;
14   console=&lt;name&gt;,io|mmio|mmio32,&lt;addr&gt;,&lt;options&gt;
15   </p><p>
16
17   The optional form
18   earlycon=&lt;name&gt;,0x&lt;addr&gt;,&lt;options&gt;
19   console=&lt;name&gt;,0x&lt;addr&gt;,&lt;options&gt;
20   is also accepted; the returned <em class="parameter"><code>iotype</code></em> will be UPIO_MEM.
21   </p><p>
22
23   Returns 0 on success or -EINVAL on failure
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